<script>
     //1 对象复制
     let person1 = {"name":"lucy","age":20}
     let person2 = {...person1}
     //console.log(person2)   //Uncaught SyntaxError: Unexpected token ...

     //2 对象合并
     let name = {name:'mary'}
     let age = {age:30}
     let p2 = {...name,...age}
     console.log(p2)
</script>